Page 2 - Mical_Nofroni_2004

P. Micali, I. Nofroni
Superfamily PYRAMIDELLOIDEA
family PYRAMIDELLIDAE
subfamily Chrysallidinae
Chrysallida penchynati (B.D.D., 1883)
Material examined
Type material: the lectotype here selected (MNHN, not fig-
ured); two possible syntypes (ZMR nos. 23842, 23873).
Other material: Camogli (Genova), -42 m, 2 shs. (PMC); Por-
tovenere (La Spezia), -15/25 m, 5 shs. (INC and PMC); Mad-
dalena Island (Sardinia), -80 m, 1 sh. (INC); Giannutri Island
(Tuscan Archipelago), -47 m, 43 shs. (INC); Giglio Island (Tus-
can Archipelago), -27 m, 11 shs. (INC); Is. Ventotene (Lazio) -
32 m, 1 sh. (PMC); Gulf of Naples -80 m, 5 shs. (PMC); Isola
Bella (Mazzarò, Messina) –32 m, 14 shs. (PMC); Capo Zafferano
(Palermo), -35 m, 2 shs. (INC).
Remarks
AARTSEN (1977) examined some samples of C. penchynati in
Dautzenberg’s collection (Brussels) and stated: “I am inclined to think
that this is no more than a form of C. obtusa (Brown), which is a very vari- INC, 1 sh. PQC); 1 sh. from Gulf of Naples -180 m, height
able species”. This opinion was shared by SABELLI et al. (1990), while
other Authors like LINDEN & EIKENBOOM (1992) and PEÑAS, TEMPLA-
DO & MARTINEZ (1996) considered C. penchynati as a valid species.
A syntype from Port Vendres (France) is stored in the MNHN
with two labels handwritten by Philippe Dautzenberg. A third
label, added more recently, bears the note “SYNTYPE Fig.”. This
specimen fits exactly the original description and drawing, and
interpretation of this species given by LINDEN & EIKENBOOM
(1992) and PEÑAS, TEMPLADO & MARTINEZ (1996).
In the Monterosato collection (ZMR) there are two vials, each
containing a single specimen. Both vials have original handwrit-
ten label by Dautzenberg. One of these possible syntypes (n°
23842) is certainly conspecific with the syntype preserved at
MNHN and there are no doubts on its identification. The second
specimen (n° 23873) was described and figured by GAGLINI
(1992) who considered it as a juvenile of C. interstincta and we
agree on this interpretation.
Since the original material consists of two distinct species we con-
sider it is opportune to select a lectotype to define the species
identity. Therefore we designate the syntype stored in the
MNHN as the lectotype and Port Vendres (near Perpignan,
Southern France) as the type locality.
Chrysallida penchynati is similar to C. interstincta, but differs in
some main morphological features. In C. penchynati the suture is
incised, gradated, so that the profile appears turriculate and no
whorl is wider than the start of the successive (as is found in some
forms, mainly juveniles, of C. interstincta). The periphery is round-
ed, while in specimens of C. interstincta of the same size the periph-
ery is angulated, an indication that they are immature specimens.
Chrysallida penchynati has a columellar plica while C. interstincta
has a columellar tooth. In C. penchynati the costae extend over the
base, while in C. interstincta they stop at the periphery.
The protoconch of C. penchynati is elevated, rounded and with-
out any sign of ombelicus, while in C. interstincta it is almost flat
> 178 <
and slightly umbilicated. The protoconch of C. penchynati has a
width of 260 µm, while in C. interstincta it measures about 300
µm. In the lectotype of C. interstincta figured by WARÉN (1991),
the protoconch diameter is estimated to be about 300 µm, and
this is the normal dimension for Mediterranean specimens. FRET-
TER et al. (1986) indicate a diameter of 200-250 µm for specimens
from Kattegat (between Denmark and Sweden), while in PEÑAS &
ROLAN (1998) a specimen from Ghana is figured whose proto-
conch diameter is estimated to be about 350 µm.
Chrysallida rinaldii n. sp.
Type material
Holotype (height mm 1.27): it is deposited in the malacological
collection of the ZMR.
Paratypes: 1 sh. from type locality (MNHN); 1 sh. from type
locality (NHML); 1 sh. from type locality (SMNH); 20 shs.
from type locality (1 sh. PMC, 17 shs. INC, 1 sh. APC, 1 sh.
GBC); 17 shs. from the Sicily Channel -70/150 m, maximum
height 2.0 mm (12 shs. GTC, 4 shs. PMC, 1 sh. FSC); 12 shs.
from Capraia Island (Tuscan Archipelago, Tyrrhenian Sea) -150
m, maximum height 1.37 mm (5 shs. ERC, 5 shs. PMC, 1 sh.
1.25 mm (PMC); 1 sh. from Gulf of Naples, Banco di mezzo,
Stn. B52, -134 m (GFC); 1 sh. from Nerano (SA), – 50/55 m
(GFC); 1 sh. from Central Adriatic Sea, - 90 m, height 1.37
mm (PMC).
Type locality and distribution
Type locality is designed Marettimo Island (Egadi Islands, Sicily,
Italy). Shells have been found in samples of bioclastic sands collected
at a depth of about 80-100 m. The new species appears widely dis-
tributed along the Italian coasts at a depth greater than 50 m.
Derivatio nominis
This species is named after Emidio Rinaldi (Forlì) in apprecia-
tion of his studies on the Adriatic malacofauna.
Description
The shell is of small size, pupoid and glossy. The protoconch is
smooth, heterostrophic, with about 1.25 whorls, immerged in the
teleoconch with an angle of about 135°. The protoconch diameter
measures about 300 µm. The teleoconch has about 3 whorls,
rather convex, separated by deep sutures, undulated by the mar-
gin of the costae. On the last whorl there are 22 to 32 costae,
larger than the interspaces, slightly prosocline, straight or gently
curved. In the interstices of the upper whorls there is a spiral
ridge positioned just above the abapical suture, visible within the
interspaces. The last whorl shows two spiral ridges, one at the
suture and one just above. Costae extend over the base, where
they became flattened, thinner and closer. At high magnification
a spiral striature may be observed in the interspaces.
The last whorl occupies about 54% of the shell height and the
aperture about 38%. The aperture is ear-shaped. The outer lip aris-
es at the lower spiral ridge almost perpendicular to surface, then
straightens to continue the profile of the spire. Below it is regularly